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Method for on-line monitoring and control of the performance of an electric arc furnace

  • US 5,099,438 A
  • Filed: 08/28/1989
  • Issued: 03/24/1992
  • Est. Priority Date: 08/28/1989
  • Status: Expired due to Term
First Claim
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1. A method for on-line monitoring and control of an electric arc furnace in the manufacture of steel using a data processing system for providing control information to control the electric arc furnace comprising the steps of:

  • (a) monitoring electrical data from the arc furnace representative of the electrical conditions and electrical power delivered to the furnace;

    (b) calculating a Stability Factor (SF) from said electrical data in accordance with the following algorithm;

    ##EQU8## Short Circuit Reactance=Constant which is derived by submerging the electrodes into the liquid steel bath and performing the following calculation;

    ##EQU9## Where;

    Megvars=measured primary reactive power;

    Current=measured average primary currentN=transformer voltage ratio(c) comparing said calculated Stability Factor with a pre-established Stability Factor for said arc furnace corresponding to a given period of furnace operation; and

    (d) introducing raw material into the furnace when the calculated Stability Factor is below the pre-established level for said period of furnace operation to raise the Stability Factor to said pre-established level.

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